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25LC040-E/ST датащи(PDF) 11 Page - Microchip Technology

номер детали 25LC040-E/ST
подробное описание детали  4K SPI ??Bus Serial EEPROM
PDF  22 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25LC040-E/ST датащи(HTML) 11 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21204E-page 11
25AA040/25LC040/25C040
3.7
Data Protection
The following protection has been implemented to
prevent inadvertent writes to the array:
• The write enable latch is reset on power-up
• A write enable instruction must be issued to set
the write enable latch
• After a byte write, page write or STATUS register
write, the write enable latch is reset
•CS must be set high after the proper number of
clock cycles to start an internal write cycle
• Access to the array during an internal write cycle
is ignored and programming is continued
• The write enable latch is reset when the WP pin is
low
3.8
Power-On State
The 25XX040 powers on in the following state:
• The device is in low-power Standby mode
(CS = 1)
• The write enable latch is reset
• SO is in high-impedance state
• A low level on CS is required to enter active state
TABLE 3-3:
WRITE-PROTECT FUNCTIONALITY MATRIX
WP
WEL
Protected Blocks
Unprotected Blocks
STATUS Register
Low
X
Protected
Protected
Protected
High
0
Protected
Protected
Protected
High
1
Protected
Writable
Writable



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